    <!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>task3</title>
	<link rel="stylesheet" href="style.css">

</head>
<body>
	<form action="">
		<input type="radio" name="stu" id="yesstu"   onfocus="showIn()">在校生
		<input type="radio" name="stu" id="nostu"   onfocus="showOut()">非在校生

		<div id="yesSelect">
			<label for="city">学校
				<select name="city" id="city" onchange="cityChange(this.value);">
					<option value="1" selected="selected">城市</option>
					<option value="2">北京</option>
					<option value="3">滁州</option>
				</select>
			</label>
			 
			<select name="beijingsch" id="beijingsch">
				<option value="1">北京大学</option>
				<option value="2">清华大学</option>
			</select>

 			<select name="chzusch" id="chzusch">
 				<option value="1">滁州学院</option>
 			</select>
		</div>

		<div id="noSelect">
			<label for="jobs">就业单位
				<input type="text" name="jobs" id="jobs">
			</label>
		</div>
	</form>
</body>
<script src="input.js"></script>
</html>